Door lock



Oct. 16, 1928. v A. DEL R0550 DOOR LOCK Filed May 192 Patented Get. 16, 1928.

STATES PATEll @Ff'ltih.

AMEDEO DEL ROSSO, OF

DOOR LOCK.

Application filed May 2, 1927. Serial No. 188,159.

This invention relates to looks for doors, gates and other similar closures; and it 0011 sists of a lock, provided with a combination levice and a key adapted for use in conjuncion with each other said lock being constructed as hereinafter fully described and claimed.

In the drawings, Figure'l is an end view of a lock constructed according to this invention, showing a portion of the door in section. 2 is a front View of the combination device and key hole. Fig. 3 is a section taken on the line 33 in Fig. l, and showing the locking disk and key shaft. Fig. 4 is a section taken on the line ll in Fig. 1, and showing the lock bolt and its driving wheel. Fig. 5 is a side view of the key. Fig. 6 is an end view of the key.

The lock is provided with a frame having three parallel plates 8, 9 and 10. The front plate 8 is secured to the door 12, or the door itself may be used instead of the front plate 8. The plates 9 and 10 are spaced apart, and are secured to the door by suitable distance pieces 14 and screws 15. A lock bolt 16 is mounted to slide in guides 11 on the inner side of the rear plate, and is adapted to enwith any suitable kee or or socket 18 on the door post. This bolt preferably has a spring 20 at one end which holds it in engasjeinent with the keeper 18.

The lock bolt 16 has a toothed rac; 21 on one side, and is a toothed wheel which mesncs with the rack 21. The wheel 22 is re our .1 on the key shaft which is journaled in the plates of the frame under the lock bolt. and which projects through holes in all of them.

The door 12 is provided with a key hole 25 arranged concentric with the key shaft, and the rear end portion of the key shaft has a knob 26 secured on it so that the door can be opened from inside of a room or building without using the key and combination device. A locking shaft 28 is journaled in the front and intermediate plates of the frame,

above and parallel to the key shaft, and has a locking disk 29 secured on it by a nut 30. The periphery of the locking disk is arranged close adjacent to the key shaft, and the lock ing disk has notch 31 in its periphery. The key shaft has a pin or projection 32 which projects crosswise of it, and which is arranged to the rear of the locking disk.

The locking, shaft 28 has a num bered and marked combination disk 85 secured on its front'end portion, and also a knob at for revolving it. I The door is provided with a numbered and marked plate 35 which surrounds the disk and the key hole isformed in this plate The plate and disk are marked so that they form combination device, and when 'the locking disk is turned around so that the notch is opposite the key shaft, certain of the predetermined marks come together.

The key 36 has a tubular end portion 37 adapted to be slid over the key shaft, and it has two similar hooks or notches 38 in its end portion which are adapted to engage with the pin 32 on the key shaft. When the notch in the locking disk is not opposite the key shaft it is impossible to insert the key far enough over the locking shaft to engage with the pin 32, becausethe end of the key strikes the locking disk. When the locking disk has been set with its notch opposite the key shaft, by means of the combination device, the key can be pushed through the notch, and placed in engagementwith the pin 32. The key is then revolved so that the lock bolt is retracted, against the pressure of its spring, by means of the toothed wheel and rack.

A lock constructed according to this invention can only be operated from outside the door by a person who knows the correct combination, and who has the proper key which will fit over the key shaft and pass through the notch in the locking disk and engage with the pin on the key shaft.

The combination can be changed by unscrewing the nut 30 which clamps the locking disk against a shoulder on the locking shaft, and then turning the locking disk around to a different position.

The locking disk 29 has pins 40 projecting from its side toward the key hole so as to strike'against the key, when the locking disk is revolvedin an attempt to find the correct combination with the key partially inserted and feeling for the notch.

What I claim is: o

1. In a look, a frame, a key shaft journaled in the frame and provided with a lateral projection between itsends, a slidable lock bolt for engaging with a keeper, means for sliding the lock bolt when the key shaft is revolved, a locking shaft journaled in the frame and arranged parallel to the key shaft, a locking disk secured on the locking shaft inside llll the frame with its periphery adjacent to the key shaft and having a notch adapted to be placed opposite the key shaft to permit the insertion 'o-fa key toengage with thersaidprolock bolt being arranged to slide in guides on the inner-side of the i'e-arplate above the key shaft, and the said locking shaft being arranged above the key shaft and jonrnaled in the front and intermediate plates of the frame.

3;. A; look as set forth in claim 1, the said locking disk being provided with lateral projections which strike the key and prevent the complete rotation of the looking disk "shaft and having a notch adapted to be placed opposite the key shaft to permit the t insertion of a key to operate the key shaft a combination device operatively connected with the locking shaft, and a projection on the said locking disk adapted to strike the key and prevent the complete rotation of the locking disk in an attempt to find the cor- I'BQUCOlHblDd-t-lOll necessary to permit the key to be slid through the said notch.

In testimony whereof I haveafiixed my signature. 7 w

AMEDEO DEL BOSSO. 

